RCS: Rotten Customer Service

I'm disgusted and appalled by the level of professionalism and customer service or lack thereof that RCS has displayed over the past few months. I noticed on 11 April 2020 that my score on Clearscore.com had depreciated from 683 in October 2019 to 578 in April 2020. I further discovered on the site that there was an account I wasn't aware of that showed on the portfolio belonging to Massbuild. I was puzzled by this as my purchases at Builders warehouse over the years were paid using my bank's debit or credit card and did not open an account with them. I did not know that one can even open an account at that establishment. I received a call on 14 April 2020 from Sheryl an agent of RCS/MBD. She queried about my payments at Massbuild to which I rep**** that I do know of such an account. She then informed that I need to write an affidavit to dispute this ********** account. Due to lockdown the police station in Gugulethu were not assisting with affidavits/document certifications. I then called the RCS/MBD on 28 April 2020 and spoke to Zimkitha, I her informed of this lockdown limitations and she said she'll escalate the complaint to the ***** department. I no call back from the RCS ***** department. On 11 May 2020, I sent an e-mail to *** and *** with the ref number supp**** via the sms’s. I received no reply from rcs except the auto-reply. I called RCS on 22 May 2020 on which I spoke to Monique (customer service) and Jade Nelson (***** department) who refused to give their last names. It is only then was informed that a dispute form is required to be completed. I sent the completed forms and copy of ID on the same. However still no call back from her manager Candice, which I requested on the call. I sent a follow-up e-mail on 27 May 2020 requesting they speed up the process and give me feedback urgently as 6 weeks had passed since my first interaction with this sorry accuse of a customer service/***** department. I received a call from an agent whose name I didn’t get, on 28 May 2020. She requested three specimen signatures to be sent to ***. I received a call from Jade on 19 June 2020 saying the dispute has been resolved and that they’ll do a back-dated correction of my credit score. Sadly the latter was not done. My score improved at the end of June, however the previous months was still incorrect. Sadly the ********** account is still open as I received another call from RCS in which I spoke to Senzakele. She enquired about late payments. I told her that I had no such account and I’ve requesting feedback on the investigation from their teamleaders/managers. She rushed the call instead of trying to listen and give me way forward. I am so sick of the level service I’ve experienced. The call centre has no soft skills training and lack client centricity. I have no received feedback via e-mail or call from these people. I’ll be escalating this further as this is infringing on my rights as a citizen. Bare in mind I'm not their customer, as the account opened **********ly in November 2019.